From 0c7fd316eb006c0afc13996c00ac8bde1078b32c Mon Sep 17 00:00:00 2001
From: Anton Kaliaev <anton.kalyaev@gmail.com>
Date: Fri, 26 Jun 2020 15:58:27 +0400
Subject: [PATCH] abci/example/kvstore: decrease val power by 1 upon
 equivocation (#5056)

in `persistent_kvstore`
---
 abci/example/kvstore/persistent_kvstore.go | 19 ++++++++++++-------
 networks/remote/integration.sh             |  4 ++--
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/abci/example/kvstore/persistent_kvstore.go b/abci/example/kvstore/persistent_kvstore.go
index 0f79a067d..1ac46b836 100644
--- a/abci/example/kvstore/persistent_kvstore.go
+++ b/abci/example/kvstore/persistent_kvstore.go
@@ -125,16 +125,21 @@ func (app *PersistentKVStoreApplication) BeginBlock(req types.RequestBeginBlock)
 	// reset valset changes
 	app.ValUpdates = make([]types.ValidatorUpdate, 0)
 
+	// Punish validators who committed equivocation.
 	for _, ev := range req.ByzantineValidators {
 		if ev.Type == tmtypes.ABCIEvidenceTypeDuplicateVote {
-			// decrease voting power by 1
-			if ev.TotalVotingPower == 0 {
-				continue
+			addr := string(ev.Validator.Address)
+			if pubKey, ok := app.valAddrToPubKeyMap[addr]; ok {
+				app.updateValidator(types.ValidatorUpdate{
+					PubKey: pubKey,
+					Power:  ev.Validator.Power - 1,
+				})
+				app.logger.Info("Decreased val power by 1 because of the equivocation",
+					"val", addr)
+			} else {
+				app.logger.Error("Wanted to punish val, but can't find it",
+					"val", addr)
 			}
-			app.updateValidator(types.ValidatorUpdate{
-				PubKey: app.valAddrToPubKeyMap[string(ev.Validator.Address)],
-				Power:  ev.TotalVotingPower - 1,
-			})
 		}
 	}
 
diff --git a/networks/remote/integration.sh b/networks/remote/integration.sh
index 2a88035af..972ae6065 100644
--- a/networks/remote/integration.sh
+++ b/networks/remote/integration.sh
@@ -10,8 +10,8 @@ sudo apt-get upgrade -y
 sudo apt-get install -y jq unzip python-pip software-properties-common make
 
 # get and unpack golang
-curl -O https://storage.googleapis.com/golang/go1.13.linux-amd64.tar.gz
-tar -xvf go1.13.linux-amd64.tar.gz
+curl -O https://dl.google.com/go/go1.14.4.linux-amd64.tar.gz
+tar -xvf go1.14.4.linux-amd64.tar.gz
 
 ## move binary and add to path
 mv go /usr/local